embarrassed silence
awkward silence
stunned silence

They continued to look at each other, and another awkward silence developed.

I didn't answer him and there was an awkward silence.

There was an awkward silence for what seemed a long time.

They looked at each other for a moment in an awkward silence.

He said nothing more and they continued on in awkward silence.

I didn't say anything, an awkward silence growing between us.

There was a short, awkward silence after I had sat down.

Then he let her go, and they stood together in awkward silence.

We were both left in an awkward silence before going on with our business.

In the awkward silence, she ran a hand through her hair.